RINA INTERNATIONAL CONFERENCE DESIGN AND OPERATION FOR ABNORMAL CONDITIONS III 26 – 27 January 2005 © 2005: The Royal Institution of Naval Architects The Institution is not, as a body, responsible for the opinions expressed by the individual authors or speakers THE ROYAL INSTITUTION OF NAVAL ARCHITECTS 10 Upper Belgrave Street London SW1X 8BQ Telephone: 020 7235 4622 Fax: 020 7259 5912 ISBN No: 1-905040-08-3 Investigation into the influence of Forecastles, Bow Visors and Pitched Hatch Covers on Green Water Loads Benedict Graat Investigation into the influence of forecastles, bow visors and pitched hatch covers on green water loads Investigate the influence of pitched hatch covers, forecastles and bow visors on green water loads Validate Hoi Sang Chaungs 2D Motion Program Investigate the use of Buchner Pressure Formula and Spectrum Analysis techniques as a design stage method to predict green water loadings Investigation into the influence of Forecastles, Bow Visors and Pitched Hatch Covers on Green Water Loads MV Derbyshire Green seas Behaviour of green water Conditions giving rise to green water loading Design features to defend against green seas Analytical Investigation Design stage method to predict loadings Model Tests Empirical Relationships Conclusions MV Derbyshire Supporting Evidence from the Wreckage Supporting Evidence from the Wreckage Green Seas Vertical motion relative to the local wave elevation exceeds the local freeboard Behaviour of Green Water Sequence of Events Relative wave motions around the bow Water flows onto the deck Shallow water wave over the deck Final impact of water to the structure Bow goes down into a wave and creates a vertical wall of water around the bulwark
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